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Mark Castell serves as Senior Vice President of Engineering for ETX, where he has oversight of Engineering, Operations, and Geology & Geophysics. Previous to joining ETX in the Fall of 2016, Mark served for seven years as Vice President – Oklahoma Assets for publicly traded PetroQuest Energy. Under his leadership, PetroQuest executed over 300 primarily unconventional Woodford Shale horizontal wells in the Arkoma Basin, making PetroQuest, and their joint venture partner, the largest unconventional operator in the Basin. Mark first joined PetroQuest in 2002 as an Asset Manager in Business Development, where he was involved in PetroQuest Energy’s expansion into East Texas, and the Fayetteville and Woodford Shales of the MidContinent.

Prior to joining PetroQuest, Mark spent fifteen years in technical, supervisory, and management positions with Chevron and Tenneco. Mark has experience in the MidContinent, East Texas, South Texas, Gulf Coast, and Gulf of Mexico areas of the US, and in Angola West Africa and the Central North Sea. He has a strong background in unconventional resources, drilling and completions, oil and gas reserve evaluation techniques, carbonate reservoirs, economics, and acquisition/sales negotiations. Mark specializes in the redevelopment of mature fields. Mark has a vast range of engineering skills and has been involved in major secondary recovery projects internationally via gas and water injection. He has also worked on valuation techniques for stranded gas and concession negotiations in the international arena.

Mark earned a Bachelor of Science Degree, Magna Cum Laude, in Petroleum Engineering from Texas A&M University. He is a Registered Petroleum Engineer in the State of Louisiana and a member of the Society of Petroleum Engineers, American Association of Petroleum Geologists, Texas Independent Producers and Royalty Owners Association, and Texas Alliance of Energy Producers.